mac: Add tracing for -[BrowserCrApplication sendEvent:].

chrome/browser/chrome_browser_application_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/chrome_browser_application_mac.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/debug/crash_logging.h"
 #include "base/logging.h"
 #include "base/mac/call_with_eh_frame.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/sys_string_conversions.h"
+#include "base/trace_event/trace_event.h"
 #import "chrome/browser/app_controller_mac.h"
 #import "chrome/browser/mac/exception_processor.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/crash_keys.h"
 #import "components/crash/core/common/objc_zombie.h"
 #include "content/public/browser/browser_accessibility_state.h"
 
 namespace chrome_browser_application_mac {
 
 void RegisterBrowserCrApp() {
@@ skipping 222 matching lines @@
 
 - (BOOL)isHandlingSendEvent {
   return handlingSendEvent_;
 }
 
 - (void)setHandlingSendEvent:(BOOL)handlingSendEvent {
   handlingSendEvent_ = handlingSendEvent;
 }
 
 - (void)sendEvent:(NSEvent*)event {
+  TRACE_EVENT0("toplevel", "BrowserCrApplication::sendEvent");
   base::debug::ScopedCrashKey crash_key(
       crash_keys::mac::kNSEvent, base::SysNSStringToUTF8([event description]));
 
   base::mac::CallWithEHFrame(^{
     switch (event.type) {
       case NSLeftMouseDown:
       case NSRightMouseDown: {
         // In kiosk mode, we want to prevent context menus from appearing,
         // so simply discard menu-generating events instead of passing them
         // along.
@@ skipping 28 matching lines @@
 - (void)_cycleWindowsReversed:(BOOL)arg1 {
   base::AutoReset<BOOL> pin(&cyclingWindows_, YES);
   [super _cycleWindowsReversed:arg1];
 }
 
 - (BOOL)isCyclingWindows {
   return cyclingWindows_;
 }
 
 @end